recently refill with freon ...coldness last about 1 month.... no sign of leaks or anything but mechanic said it's possible it's the compressor ... has anybody experience this problem before?
how much to replace with a new compressor?

 

if your coldness lasted 1 month, and you don't hear any strange noises, I doubt your compressor is giving you problems. You most likely have a leak...

 

try using the coolant that has the Leak Dye ... so you can see where the leak is .. if it is leaking